Bifocal spectacles



NOV. 12, 1929; v, STEWART 1,735,021

BIFOCAL SPECTACLES Filed May 15, 1925 amoeutoz 1;- WZAPW 95 AQuiet/140436 Patented Nov. 12, 1929 PATENT OFFICE,

' VICTOR A. STEWART, OF NEW YORK, N. Y.

BIFOCAL SPECTACIIES Application filed May 15,

The invention relates to spectacles having lenses of the bi focal type'wherein the read ing glass portion of the lenses may be adjusted asdesired between a'lower position which will be used for reading'purposesand an upper position wherein they will be out of'the ordinary line ofsight.

One object of the invention is to provide spectacles of the above typein which the '10 lenses may be easily moved from one position to theother but yet will be effectively held against accidental displacementwhen once they are adjusted. Further ob'ects and advantages of theinvention will e in part obvious and in part specifically pointed out inthe description hereinafter contained which taken in connection with theaccompanying drawings, closes a preferred embodiment thereof. Suchembodiment, however, is to be considered merely as illustrative of itsprinciples.

In the drawings Fig. 1 is a front elevation of a pair of spectaclesconstructed in accordance with the invention.

Fig. 2 is a transverse section-through one of the spectacles.

The invention as illustrated is applied to spectacles having a frame ofany suitable nature provided with rims 1 and lenses 2 with theirbi-focal portions 3. Each of the lenses is held within what I term arider 4 which preferably consists of a piece of sheet metal bent aroundinto annular form over the peripheral edges of the lenses and fittingrotatably within the rim 1.

In accordance with the present invention a snap fastening device isprovided between the rider 4 and the rim to hold the lenses in properlXadjusted position.

5 shown the rider 4 has a finger piece 5 attached thereto andpro'ectingoutwardly therefrom so as to engage etween lugs6 and 7 atdiametrically opposite points on the rim 1. When it is desired to shiftthe lenses the finger piece 5 will be forced over lug 6 and moved aroundthrough an arc of 180 until it snaps into position between thediametrical- 1y opposite lugs 6 and 7, the fin or piece beingsufliciently resilient to' ena le it to be dis-' 1925. semi No. 30,412.

moved past lug 6 as aforesaid, but yet holding the lens in properposition against ordinary accidental displacements. As shown, the lug 7is somewhat larger than lug 6, and forms a positive stop against furtherrotation.

In the illustrated form of the invention the finger piece 5 is providedwith a base 8 overlapping and secured to the meeting ends of the rider4, as by screws 9, thus serving to hold the ends of the rider in properrelation to each other.

While a specific embodiment of the invention has been disclosed, it willbe obvious that changes may be made therein without departing from itsessentials as defined in the following claims.

I claim:

1. Spectacles having a frame including a rim, a rider rotatably mountedwithin said rim and supportinga lens, of the bi-focal type, said rider'and frame having parts engagmg to form a snap fastening device forholding the reading glass portion of the lens in raised or loweredposition.

2. Spectacles having a frame including a rim, a rider rotatably mountedwithin said rim, and-supporting a lens of the bi-focal type, a fingerpiece projecting outwardly from said rider, said frame havin sets ofspaced lugs disposed at substan lally diametrically opposite pointsthereon and between which said finger piece may be selectively snappedto hold the reading glass portion ofthe lens in raised or loweredposition.

3. Spectacles having a frame includin a rim, a rider comprising a splitring rotatably mounted in said rim, and supporting a lens of thebi-focal type, a'finger piece extending outwardly from said rider andhaving a base secured to the ends thereof, and means disposed atsubstantially diametrically opposite points on said frame andcooperating with said finger piece to form snap fastening devices forholding the readin glass portion of the lens in raised or lowereposition.

In testimony that I claim the foregoing, I have hereunto set my handthis 23rd day of April, 1925.

vr'c'ron A. STEWART.

